I would say virtually all your gear is plastic. Apart from the obvious items, all artificial fibres such as nylon, polyamide, polyester, polybutyl are plastics so that includes most of your clothing, your pack and the soles of your boots as well as the uppers if they are not leather,. They are not of themselves bad, they are hard wearing and usually better at their job than the "natural" alternative. I put "natural" in quotes as they themselves are the products of the agriculture industry and all that that implies. The issue is correct disposal of the items at the end of their useful lives.